However, once they’ve been downloaded, they need to be properly “unzipped” to be accessed and utilized via serum. When you first download a pack, they typically come in a zip or rar file – these are compressed folders that make it easier to compile files together and easily download them at once. As an example, here I’ll be unzipping and using Gravitas Create’s Mutate – Hybrid Trap sample pack. How to Install Serum Presets Step 1: Download The Packįirst, download your desired preset packs. 2 Free Serum Presets to Install Right Now.1.4 Now, you’re almost ready to make use of your brand new serum presets!.